Journal
WATER RESEARCH
Volume 44, Issue 9, Pages 2735-2744Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2010.02.006
Keywords
Trimethoprim; Direct photolysis; Solar TiO2 photocatalysis; LC-TOF-MS; Photoproducts
Funding
- Andalusia Regional Government [P06-TEP-02329]
- Spanish Ministry of Science and Innovation [CTQ 2005-09269-0O2-01]
- CAPES Foundation-Ministry of Education of Brazil [3763-05-6]
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Direct photolysis and solar TiO2 photocatalysis of Trimethoprim (TMP) in different water matrices (demineralised and simulated seawater) have been studied. Direct photolysis yielded a similar, slow TMP degradation rate in both water matrices, and the formation of very stable photo-transformation products. Dissolved organic carbon decreased slightly after prolonged irradiation. The main intermediate identified was a ketone derivative (trimethoxybenzoylpyrimidine), which was proved to be a photosensitizer of TMP degradation. During TiO2 photocatalysis, TMP was completely eliminated in both water matrices at a similar rate, however, the mineralization rate was appreciably reduced in seawater, which can be explained by the presence of inorganic species acting as hydroxyl radical scavengers, and directly affecting photocatalytic efficiency. Identification of intermediates showed differences between the two processes but hydroxylation, demethylation and cleavage of the original drug molecule were observed in both. (C) 2010 Elsevier Ltd. All rights reserved.
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